// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
#define UI_AURA_CLIENT_VISIBILITY_CLIENT_H_

#include "ui/aura/aura_export.h"

namespace aura {
class Window;
namespace client {

    // An interface implemented by an object that manages the visibility of Windows'
    // layers as Window visibility changes.
    class AURA_EXPORT VisibilityClient {
    public:
        // Called when |window|'s visibility is changing to |visible|. The implementor
        // can decide whether or not to pass on the visibility to the underlying
        // layer.
        virtual void UpdateLayerVisibility(Window* window, bool visible) = 0;

    protected:
        virtual ~VisibilityClient() { }
    };

    // Sets the VisibilityClient on the Window.
    AURA_EXPORT void SetVisibilityClient(Window* window, VisibilityClient* client);

    // Gets the VisibilityClient for the window. This will crawl up |window|'s
    // hierarchy until it finds one.
    AURA_EXPORT VisibilityClient* GetVisibilityClient(Window* window);

} // namespace clients
} // namespace aura

#endif // UI_AURA_CLIENT_VISIBILITY_CLIENT_H_
